The tread pattern itself is Morse code for "JPL" (·--- ·--· ·-··)
Interesting that the tires or roller tracks or whatever the term is have the two different types of tread. One section for sand, the other for hard rock? Spin until they get traction? And they also appear elliptical, not round, unless that is just my astigmatism.
Interesting you should ask.
Each wheel has a pattern which helps it maintain traction but also leaves patterned tracks in the sandy surface of Mars. That pattern is used by on-board cameras to judge the distance traveled. The pattern itself is Morse code for "JPL" (·--- ·--· ·-··) JPL: Jet Propulsion Laboratory
The tread pattern itself is Morse code for "JPL" (·--- ·--· ·-··)